1. British Spinal Registry British Association of Spine Surgeons Middlesbrough February 2007 John O’Dowd Nicky Courtier

2. Low back data set  538 cases Mean age 52 Mean age 52 Male/female 45/55 % Male/female 45/55 % Pain Pain Back11.3%Back11.3% Leg16.6%Leg16.6% Back and leg72.1%Back and leg72.1%

3. Low back data set  538 cases Diagnosis Diagnosis Disc herniation39.1%Disc herniation39.1% Stenosis36.3%Stenosis36.3% Degenerative spondylolisthesis 14.6%Degenerative spondylolisthesis 14.6% Degenerative scoliosis1.2%Degenerative scoliosis1.2% Previous decompression6.1%Previous decompression6.1% Previous fusion2.5%Previous fusion2.5%

4. Low back data set  Procedure Discectomy37.9% Discectomy37.9% Segmental decompression46% Segmental decompression46% Foraminotomy14% Foraminotomy14% Laminectomy10.7% Laminectomy10.7% Posterolateral fusion20% Posterolateral fusion20% Anterior fusion1.6% Anterior fusion1.6% Circumferential fusion0.4% Circumferential fusion0.4% Stabilisation17.86% Stabilisation17.86% Arthroplasty2.5% Arthroplasty2.5% Revision decompression3.3% Revision decompression3.3%

5. Low back data set  Implant None53.4% None53.4% Translaminar screws0.4% Translaminar screws0.4% Pedicle screws24.1% Pedicle screws24.1% DYNESYS14.6% DYNESYS14.6% Wallis4.4% Wallis4.4% Cage2.4% Cage2.4% Disc arthoplasty3% Disc arthoplasty3%

6. Low back data set  Complications % if full reporting Nerve root injuryn=20.4% Nerve root injuryn=20.4% Cauda equinan=00 Cauda equinan=00 Dural tearn=203.7% Dural tearn=203.7% CSF leakn=101.8% CSF leakn=101.8% Infectionn=61.1% Infectionn=61.1% Early revisionn= 40.7% Early revisionn= 40.7%

7. SINGLE LEVEL LUMBAR DISCECTOMY  Total cases106 Age 43.36 M/F 62%/38% Age 43.36 M/F 62%/38%  Level L3/43.8% L3/43.8% L4.538.1% L4.538.1% L5/S158.1% L5/S158.1%  Side Left49% Left49% Right51% Right51%

8. BASS Audit  Decompression Yes91% Yes91% No9% No9%  Microscope Yes3% Yes3% No97% No97%  Intraoperative xray to confirm level Yes29.6% Yes29.6% No70.4% No70.4%

9. BASS Audit  Disc Sequestered12.6% Sequestered12.6% Extruded17.9% Extruded17.9% Contained69.5% Contained69.5%  Pre op ODI average49.3% ( n=23) ODI average49.3% ( n=23) VAS leg6.2 (n=25) VAS leg6.2 (n=25) VAS back 5.6 (n=21) VAS back 5.6 (n=21)

10. BASS Audit  Dural tear Yes2.9% Yes2.9% No97.1% No97.1%  Arachnoid intact Yes42.9% Yes42.9% No57.1% No57.1%  Free CSF Yes37.5% Yes37.5% No62.5% No62.5%

11. BASS Audit  Tear repaired Yes20% (n=1) Yes20% (n=1) No80% (n=4) No80% (n=4)  Suture Yes40% (n=2) Yes40% (n=2) No60% (n=3) No60% (n=3)  Patch Yes20% (n=1) Yes20% (n=1) No 80% (n=4) No 80% (n=4)  Drain Yes80% (n=4) Yes80% (n=4) No 20% (n=1) No 20% (n=1)

12. BASS Audit  Vascular injury0  Blood loss > 250 mls0  Post op complications2.4% (n=2) Increased neurological deficitn=1 Increased neurological deficitn=1 Recurrence < 3monthsn=1 Recurrence < 3monthsn=1 Infectionn=1 (1.3%) Infectionn=1 (1.3%) Reoperation all causesn=0 Reoperation all causesn=0